[jira] [Created] (SPARK-12027) Spark on YARN won't ever ask for more executors than there were containers at time of context creation

["Hunter Kelly (JIRA)" <ji...@apache.org>]

Hunter Kelly created SPARK-12027:
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             Summary: Spark on YARN won't ever ask for more executors than there were containers at time of context creation
                 Key: SPARK-12027
                 URL: https://issues.apache.org/jira/browse/SPARK-12027
             Project: Spark
          Issue Type: Bug
          Components: Scheduler, YARN
    Affects Versions: 1.5.2
            Reporter: Hunter Kelly


Looking at YarnSchedulerBackend, it appears that totalExpectedExecutors is only ever set at startup.

Based on my experience of running on EMR (and a quick browse through the code supports this), Spark will never ask for more executors than what this was set to.

This means that if I add more nodes to my YARN cluster, Spark will never pick them up.  This is bad.  The whole point of using Spark on EMR/YARN is to be able to add or remove nodes to the cluster and have Spark "Do The Right Thing".



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